CloudFormation

Overview

Infracost supports both YAML and JSON formats for CloudFormation (CFN). The following outlines support for the various CFN features:

Feature	Support
Resources	✅
Parameters	✅
Mappings	✅
Conditions	✅
Transforms	✅
Outputs	✅
DependsOn	✅
Rules	✅
Modules	❌
Intrinsic Functions	✅
Nested stack support	✅
Language extensions	✅
Pseudo parameters	✅
Dynamic references	❌
Hooks	❌
Stack/org tags	❌

Transform support

Name	Type	Support
AWS::Serverless-2016-10-31	Native	✅
AWS::Include	Native	✅
AWS::LanguageExtensions	Native	✅
AWS::CodeDeployBlueGreen	Native	✅
Count	Community	✅
Explode	Community	✅
Boto3	Community	✅
ExecutionRoleBuilder	Community	✅
PyPlate	Community	❌
StringFunctions	Community	✅
S3Objects	Community	✅
ShortHand	Community	✅
StackMetrics	Community	❌

Intrinsic support

Name	Type	Support
Base64	Native	✅
Equals	Native	✅
And	Native	✅
Or	Native	✅
Not	Native	✅
Condition	Native	✅
FindInMap	Native	✅
FindInMap (extended)	LanguageExtensions	✅
GetAtt	Native	✅
GetAZs	Native	✅
If	Native	✅
ImportValue	Native	❌
Join	Native	✅
Ref	Native	✅
Select	Native	✅
Split	Native	✅
Sub	Native	✅
Transform	Native	✅
ForEach	LanguageExtensions	✅
Length	LanguageExtensions	✅
ToJsonString	LanguageExtensions	✅

Rain support

Name	Type	Support
Rain:Embed	Directive	❌
Rain:Include	Directive	❌
Rain:Env	Directive	❌
Rain:S3Http	Directive	❌
Rain:S3	Directive	❌
Fn::Select	Intrinsic	❌
Fn::InsertFile	Intrinsic	❌
Fn::Invoke	Intrinsic	❌
Modules	Entrypoint	❌
Packaging	Entrypoint	❌

Limitations

Tagging policies

Infracost tagging policies create issues for resources where tag values are invalid, but do not create issues for missing tags on CloudFormation resources. Tags can be defined directly in AWS (for example, as stack-level tags in the console or CLI), and since Infracost does not have access to those tags, missing tags are not checked in order to avoid false positives.